Gear pump



Dec. 27, 1955 Filed Aug. 27 1951 w. F. sfoERMER GEAR PUMP 6 Sheets-Sheet 1 INVENTOR VVz'ZZz'am EHZ Oerme r BY MQ'LM ATTORNEY5 Dec. 27, 1955 w g R ,728,30

GEAR PUMP Filed Aug. 27, 1951 6 Sheets-Sheet 2 INVENTOR 266 F me ATTORNEY Dec. 27, 1955 w. F. STOERMER 2,728,300

GEAR PUMP Filed Aug. 27, 1951 8 Shets-Sheet 5 IN VENTOR WZZZiamESZbe rmer Dec. 27, 1955 w. F. STOERMER 2,728,300

GEAR PUMP Filed Aug. 27, 1951 6 Sheets-Sheet 5 INVENTOR T Vz ZZz'amFSZbermer ATTORNEYS Dec. 27, 1955 w. F. STOERMER GEAR PUMP 6 Sheets-Sheet 6 Filed Aug. 27, 1951 INVENTGR BY MM ATT RNEYS William F. Stoermer, Corry, Pa., assignor to- Aero Supply Mfg, (20., Inc.,. Corry,,Pa.

Application August; 1951", Serial-No. 243,803 l-Clainn (Cl. 103-126) Thisinvention relatesto-gearpumps.

Amebject. of. this inventionisto provide. a pump em.- bodying a plurality of. intermeshing gearshaving a. common driving. gear. with. an improved port. arrangement, whereby fluid. will-be admitted to. and discharged. from the gears.

Another: object ofthis invention is: to. provide. a. gear pump which willhave increased capacity over. similar pumps at present available.

Asfurther objectofthis inventionis to provide a gea-r pump which .isformed of a central plate having-apertures therethrough in which. the gears rotatably engage, an outer. plate at one sid'eof the central platev havinggone or more intake ports, and. a. second outer. plate. on.the opposite side of the central: plate having one or more outlet ports.

A. further object of this. invention is to provide a. gear pump WhiCh..iS. so. constructed and arrange'd'that it may be producedasavery compact pump structure.

A..further. object of. this invention istoprovide a gear pump strncture embodying a centralplate and outer plates on. each side of.the central plate, the latter being formed with a. central opening in which a driving gear-.rotatably engages, and. also:two or more openings adjacent to and communicating with the central. opening and. in-Wh'ich-the driven gears are journalled, the arrangement. being; such as: toeliminate the necessity of any shafts or'studsfor the drivengears.

A further important object. of the invention. is to-provide a gear pump embodying a driving gear and two or more drivengears wherein. theidriving, gear is so related in diameter to the driven. gears as to obtain from a unit of an overall fixed size a maximum of pumping capacity within a minimum sizeof unit, and whereby thecapacity ofa fixed size unit may beincreased beyond what'would be the normal therefor withonly a conventional type arrangement of gears.

With the aboveand other objects-in view, my'invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more-particularly pointed out'by the appended 'cl'aim.

In the drawings- Figure 1 is a detail frontelevation' of a pump const-ructed according to an embodiment of this invention,

Figure 2 is a detail. side elevatiorr'ofthe pump,

Figure 3 is. a sectional view taken on the line 3---3 of Figure" 1,

Figure 4 is a fragmentary sectional view taken on the line 4-4 of Figure 3,

Figure 5 is a sectional view taken on the line 5-5 of Figure 3, I

Figure 6 is a side elevation of the intake plate,

Figure 7 is an inner side elevation of the outer end of the housing,

Figure 8 is a detail side elevation of the outlet plate,

Figure 9 is a fragmentary sectional view taken on the line 9-9 of Figure 5,

States Patent 0 2,728,300 Patented ,Dec.. 27,, 1955 Figure-.10 is an; inner: side elevation of: the innrrfiendv of hehousing:

Figure-1.1. is an outer. end. elevation of .the: inner. wall. of the housing,-..

Figure 12. is afragmentarysectional view takenon the line.1 2-12.- of Figure 5,.

Figures 1-3 to. 1.6..are diagrammatic views of aseries of modified forms. ofi this invention.

Referring to the. drawings, the. numeral. 15 Y designates generally. a centrally disposed disc-shaped. plate or body whichds. formed .wit'h-a pair. of oppositely disposedintake openings. 19 and-.20,,and. is. also formed with a pair of oppositely disposed outletopenings 21 and. 22. An. inner disc-shaped. plate 23: is. disposed. in face abutting relation tothe inner side of. the-central plate or body 15, andqis formedwith a. pair of oppositely disposedrintake openings 24 and. 25, adapted to.- registerr'with the intake openings wand 20 of central plate or bodylS.

An-outer disc-shaped. plate. 26 1's disposediin face abut? ting .r.elati0n. tothe outer sideot central. plate or body 15-, and is formed witha pair of oppositely disposed outtonal' portion 31 of a-drive.shaft32is adapted to engage.

A. driven gear 33' is. rotatably disposed within the opening 17 meshing with gear- 29, and a second driven gear 34 is. rotatably disposed in opening 18 and. also meshesswith. central drivingrgear- 29. The twosmaller gears 33. and. 34 are. journalled within the openings 17 and. 181 so that itwill not benecessaryto provide any pinionsorstub shafts. forthese gears:

A liousinggenerally designated as 35 e'ncases the; pump end wall. 37, liquid,v such. as. oil. or. the like, channels 39" and 40. through the her 38;

The cylindrical body 36 is flange 48 p will be drawn. into the recess or" intake charm 54. The housing 35 has extending therefrom an outlet nipple 56 which communicates with a chamber 57 formed in the boss 58. The chamber 57 includes an inwardly extending chamber or channel 59 which communicates with radial channel 55. The nipple 56 is formed with right angularly disposed bosses 60 and 61 adjacent the outer end thereof so that the fluid may be taken ofi from 'the nipple 56 by a connection disposed coaxially with the nipple 56, or a connection extending at right angles thereto. It will, of course, be understood that the plug will be inserted into the unused boss 60 or 61.

In the use and operation of this pump, the shaft 32 is connected at its inner end to a driving means such as the drive shaft of an engine or other suitable driving means. As shown in Figure 3, the outer end of the shaft 32 is rotatably disposed in bearing sleeve or bushing 62 carried by the outer end wall 49, and a thrust ball 63 is disposed in a seat 64 formed in the outer end of the shaft 32 and bears against a thrust plate 65 countersunk in the plate or end wall 49. It will be understood that the gear pump which comprises the central plate 15 and the two plates 23 and 26, with the gears 29, 33 and 34, may

be encased in any suitable housing. The housing hereinbefore described shows one specific form of housing which was particularly designed for a specific type of engine or power means.

With rotation of shaft 32, gears 29, 33 and 34 will be rotated therewith and fluid such as oil or the like will be drawn into chamber 38 and into the intake openings 24 and 25 of inner plate 23. The fluid will then be carried outwardly in the openings 17 and 18 and will be discharged from the valleys of the teeth of the gears through the discharge openings 21 and 22 in central plate 15 and outlet openings 27 and 28 in outer plate 26. The fluid passing through the openings 27 and 28 will enter the annular opening 54 and then will be forced out through chambers 59 and 57 into outlet nipple or connection 56. The provision of the relatively large driving gear 29 and the smaller driven gears 33 and 34 provides an improved e means whereby an increased capacity will be provided in a relatively small compact pumping unit.

Referring now to Figure 13 there is disclosed a modifled form of this invention wherein the driving gear 65 is the same diameter as the pair of driven gears 66, and each gear is formed with 20 teeth. The dot and dash line 67 indicates the efie'ctive circular area Within which the pump may be disposed.

In Figure 14 the driving gear 68 is larger in diameter than the driven gears 69 and 68 and has 20 teeth, whereas gears 69 have teeth. The pumping capacity of gears 68 and 69, however, is the same as the arrangement shown in Figure 13, but the circular area 70 of gears 68 and 69 is substantially less than circular area 67 of Figure 13. In Figure the driving gear 71 has teeth and the three driven gears 72 have 10 teeth. The addition of a third driven gear increases the capacity of the pump by In Figure 16 the capacity of the pump is increased within the same effective area by arranging the driving gear 73 with four driven gears 74 and the driving gear 73 is formed with twice as many teeth as each driven gear. In Figures 14, 15 and 16 the e'fiective circular area of the gears is the same, but the variation in the number of driven gears provides the desired increased pumping capacity. An'outstanding feature of this unit is that the use of an enlarged driving gear with smaller driven gears will deliver more fluid than a unit comprised of equal diameter gears, the overall size of the units being identical. This feature will be clearly understood by a comparison of the Figure 13 with the Figures 14 to 16.

I do not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the appended claim.

- What 1 claim is:

A gear pump comprising a housing having a cylindrical bore, a wall integral with said housing extending transversely of said bore at the inner end thereof, said wall having a central bore axially aligned with and substantially smaller than said cylindrical bore, said wall having spaced apart inlet ports extending therethrough, a tubular outlet fitting integrally attached to said housing, a shaft journaled in said central bore and extending into said cylindrical bore, a central plate having an axial bore and a pair of diametrically opposed bores each intersecting and overlapping said axial bore, a pump driving gear rotatably disposed in said axial bore in keyed relation to said shaft, a driven gear disposed in each of saidpair of opposed bores with each meshing with said driving gear 5 whereby to rotate therewith, a pair of outer plates engaging against opposite faces of said central plate with said plates mounted within the cylindrical bore in said housing, one of said outer plates engaging said wall and having a pair of transverse inlet openings therein aligned with the inlet ports in said wall on one side and with the unmeshing junctures of said driving and driven gears on the other side, the other of said outer plates having a pair of transverse outlet openings aligned with the meshing junctures of said driving and driven gears on the other side, said cylindrical bore in said housing having at the end thereof opposite said wall an annular recess terminating in an axially extending radially offset flange, a cylin' drical end wall having inner and outer faces with said inner face in engagement with said second outer plate, a flange formed on the peripheral'edge of said end wall adjacent said outer face, said end wall having a conduit formed on said inner face connecting said outlet openings in said second outer plate with said tubular outlet fitting, and a sealing ring positioned between the peripheral edge of said end wall and the base of said annular recess sealing said end wall to said housing.

References Cited in the file of this patent UNITED'STATES PATENTS 

